US1787827A - Bit-forming machine - Google Patents

Description

"Jan 6, 1931.

N. D. LEVIN I'IAL BIT Folimme MACHINE Filed April 30, 1925 :s sham-sum 1 Jan 6, 1931. N. n. LEVIN ETAL BIT FORMING MACHINE Filed April 30, 1926 3 Sheets-Sheet 2 .i I I N. D. LEVIN ETA]. 1,787,827

BIT FORMING MACHINE Filedapriil 30. 1926 3 Sheets-Sheet 3 0 \N I a m k m Jan 6; 1931.

Patented Jan. 6, 1931 I UiN r srA Es v NILs n. LEVIN Ann nnns'r rnonon MULLER,.OF ooLU B s, OHIO, ASSIGNORS r THE OF COLUMBUS, 01110, A CORPORATION or hand upbn an anvil lack the uniformity of shape and size essential tothe' economical we are familiar, possess certain inherent de} 1 JEFFREY MANUFACTURING ooMrAnY',

onro PATENT; oFF cE BIT-FORMING MA cniNn "Application filed Apri130, 1926. Seria1 No.105;843. v

- Thepresentinvention relates to certain new and useful improvements n bit forming machines, and particularly 1 to machines adapted to form cutter bits suitable for use inthe cutter chains ofcoalmining machines, and similar objects. a

In the method of mining coal which is commonly practiced at the present time kerfs', or grooves, are formed in the face'of the vein to afiord a cleara-nce into which the coal may be moved by blasting, or other suitable means, to break up and dislodge 1t.

These kerfs are commonly cutby tools, known as cutter bits, attached to an endless chain adapted to travelin guideways upon the cutter arm of the mining machine. In

such'service the points of the bits soon wear off and become dull, and the dull bits must be replaced bysharp ones. tates, the reshaping and sharpening of large number of cutter bits, and each mine is usually provided with a smithy where such work is performed. Cutter bits formed by operation of a mining machine.- The satisfactorily operable machines heretofore available for the production of cutter bits have been ponderous affairs only suitable for use in large manufacturing establishments and entailing very considerable initial investment. Numerous attempts have been made to produce relatively small and inexpensive machines adapted to use in the blacksmith;

shops associated with coal mines. All such machines heretofore constructed, with which fects which itis the object of thisinvention to overcome. Y Y

It is the especial object of this invention to provide an eflicient durable and inexpensive machine, suitable for use in the blacksmith shop associated with the coal mine, whereby accurately formed bits may be conviently and economically made from new This necessirolled bar'stock, andfbit's'worn in service may be reformed and renewed. U

The means whereby we attain this object are fully set forth in the following specification, and illustrated, in the accompanying I drawings of whioh Fig. 1,'is a side elevation ofthe preferred embodiment of our invention. 7 V Fig.2, is anend elevation. I 1 V Fig. 3, 1 is a planpview of the machine shown in Fig. 1. f 1:

Fig. 4,- is a sectional vie'w'taken along line IV.IV of Fig. 2.

i Fig. 5,1is asectional View taken along the line of of 1, showing the die in operative relation with the roll..

Fig. 6, is a fragmentary sectional view taken along the line VIVI of Fig. 4.

Fig. 7, is a fragmentary sectional view.

taken along'the line'VII-VII of Fig. 3.

, Fig. 8, is a-diagrammatic perspective view.

of the bit marking mechanism.

.Fig. 9, is a fragmentary sectional view showing the ejecting mechanism.

Fig. 10 is a perspective detail of the die upon which the bits are formed;

Like numerals refer to similar parts in the several figures.

In the drawings the numeral 1 refersto the main frame of the machine. Journaled in bearings 2 of the main frame 1 is a transversely extending shaft 3 to the projecting end of'whieh is fixed a spur gear 4:. The gear 4 meshes with a pinion 5 which is rotatable upon a stud shaft 6 projecting from the frame 1. Fixed to the pinion 5 is a fly. wheel pulley 7 adapted to be. connected by a suitable endless belt, not shown in the drawing, with a convenient source of rotative power to cause continuous revolution of the shaft 3. Fixed vto the shaft 3 between the journal bearings 2, is a bit forming roll -8 in the peripheryof which is formed a circumferential groove 9 the contour of which corresponds to the form of the back of the cut the hand of the operator; Formed on theshaft 11 between the bearings 10, isa cylindricalenlargement 13 which is eccentric of the bearin 's 10, and upon the cylinder leis journaled a hub 14. Projecting upwardly from the hub 14 is a radial arm 15 to the outer end of which is fixed the-anviljl6 which is' of circular curvature concentric with the cylinder 13. These parts are of such proportions that rotation ofthe-shaft $11 will cause the eccentric 13 to lift the. anvil 16 into forced engagementwith, the con-;

stantly revolving forming roll- 8, the frictiona-l efi'ort of- 'which tends to drive the anvil 16 forwardly about its axis 13. A spring'17 connected atone endjtothe main frame 1 and at the other end to the arm 18 formed on the hub 14, tends to rotate the anvil 16 rearwardly and to retainit in its idle position in Contact withqthe stop .19 when the frictional cont-act lwith the roll 8 is-r'eleased; A resilient stop .20 fixed to thefrain'e 1 is adapted to'engage the forward end of the anvil 16 to limit its movement; H

Fixed in a suitable recess of the anvil 16 is the die 21 which consists of a steel plate the upper edge 22 of which projects above the surface of the anvil and is shaped to conform to the contour of the groove 9 in the roll 8 with which it registers. The forward end of the plate 21 is shaped at 23 to form the face of a cutter bit in a. manner which will hereinafter appear. The face 23 of the die 21 is transversely corrugated as shown in Figs. 7 and 10, to reduce the tendency of the metal to slip upon the die during the formingoperation. Immediately infront of the' die plate 21 is'a socket 24 adapted to receive I and hold in place the bit steel 25 during the operation of forming. When a suitably to squeeze the metal against the die block.

and form the cutting'head of the bit. Aplunger26 slidably'mounted in the sock:

set 24, engages the lower end of the bit steel 25 to hold it in place, and awedge 27 a'r-' rangedito engage the lower end oft-he plung- @1 26 serves to limit its downward movement. Fixed t o the wedge 27 is a rearward extending rod 28 upon which is formed a screw thread engaged by a knurled head 29 mounted in the anvil casting and securedagainst longitudinal movement relative thereto.

- The knurled head-29 is positioned convenient that position. v v shaft '45, and to this arm 1S fixed a roller 49 adapted to engage the anvil 16 as it moves to the hand of the operator, and by its rotation the wedge 27 may be moved forward and backward to adjust the position of the plunger longitudinal of the socket 24, thereby adapting the machine to the formation of bits of different lengths.

' A- bell crank 30,pivotally mounted upon a stud 31 fixed to the machine frame 1, isprovided with a downwardly projecting arm 32 and a horizontal projecting arm 33, and is normally maintained in its idle position by a stop 34 formed on the machine frame 1 which engages the rearward face of the downwardly projecting arm 32. A pin 35 projecting laterally from the anvil casting, is adapted to engage the arm 32 of the bell crank when the anvil approaches. the forward limit of its movement, causing the horizontally projecting arm 33 to move upwardly into contact with the finger 36 of the plunger 26, to liftsaid plunger and thereby eject thc bit steel 25 from the socket. As the bit 25 moves upwardly it is engaged by a spring 37 and forced laterally into the chute 38 by which the bits areconducted'a-Way from the machine; j I

' Iii ord-er that tl1e:bitsniay be accurately positioned in themining machine chain, we

have provided means forcutting a nick in the bit shank at the depth to which it should extend into the socket of the cutter chain. This nicking device consists of a tool 39 attached to a. vertical shaft 40"journaled in a bearing 41' of the machine frame. These parts are so proportioned and positioned that when the nicking tool 39' stands in one position of its angular adj ustment'aboutthe axis of the shaft 40 it will engage the co'rner of the bit st'eel25 to cut a. notch therein. Fixed to the shaft 40 is a crank arm 42 connected by a rod 43 with a siinilar crank arm 44 fixed to a horizontally disposed shaft 45. A tension spring 46', attached at one end to the machine frame and at the other end toa second arm 47which is also fixed to the shaft 45, tends to rotate the nicking tool 39to its operative position, and to resiliently hold it in Anarm 48 is fixed to the forwardly, and through the connections above described, to rotate the nicking tool 39 into its idte position at one side of the path of'the' cutter bits 25. These parts are so proportioned and arranged that, ass'oon as the iiickinp; tool 39 has nicked the corner of the bit, saidtoolwill beinoved aside, out of the path of bit25, to prevent further interference with its movements. I When new bits are formed from rolled bar stock it is desirable that the end of the steel be'sdn'rewhat memento facilitate forming underfthe roll For th s purpose we have provided asqueezing device comprising eccentric 50-, formed on the projecting end of the shaft 4, and fittedwith an eccentric rod 51. "To the lower endof the eccentric rod 51 is fixed'a die block 52 adapted to cooperate suitable for working. As each piece is taken from the heating furnace its end is inserted between-the dies 52 and to be pointed preliminary'to the final rolling operation. The bli steel 25 is then inserted, with its pointed end upward in the sockets 24 of the anvil. The knurled head 29 may'then be manipulated to cause the proper amount of. steel to project from the socket Qel. By movement of the.

lever l2the anvil iselevated into contact with the roll 8 and driven forward thereby carry-- ing the bit steel beneath the roll Shy which its metal is squeezed against the face of the die accurately forming the cutting head of the bit; As the bit is carried beyond the roll 8, the nicking tool-39 placesa nick" in its side to indicate the depth to which it should be'inserted in the socket of the min-' ing' machine chain, after which the'ejecting mechanism discharges the finished bit from thefsocket 24 onto the chute 38 in the manner above described.

In the mechanism above described we have" PlOVlQlGQlEL relatively-small and inexpensive;

machine, convenient and economical ofoperati'on, whereby cutter bits may-i beaccurately and expeditiously formed, andby which hits worn in service be sharpened and renewed.

W hat we claim is 1. In a'bit forming machine, the combination with a power driven continuously revolving roll having a continuous peripheral forming face, of an anvil mounted adjacent said roll and having asurface adapted to frictional engagement therewith whereby said anvil may be caused to move relative to said roll, and adie carried by said anvil to the rear of its initial point of engagement with safe roll adapted to cooperate with said roll at all peripheral points thereof to form a cutting head upon a suitably disposed bit steel as and for the purpose set forth.

2. 111 a bit forming machine, the combination with a supporting frame, of a continuously revolving roll mounted in fixed position upon said frame, a. shaft'spacedfrom and extending parallel to the of said roll and ournaled 1n bearings of said framepa ylindrical enlargement formed on said shaft eccentric to said journaled bearings, an anvil pivotally mounted upon said cylindrical enlargement and having an arouate surface concentric therewith, means to rotate said shaftto cause said eccentric to move said arcuate surface into frictional engagement Wllill SL1Cl steel roll to cause rotary movement. of said anvil about saidi'cylindrical enlargement, stops 'arranged upon the frame to limit r'otarymove ment of said anvil: in eitherdirection, and

meansto move saidanviiwrearwardly upon the interruption of" said frictional engagement as and for-thepurpose set forth.

.3. Inabit forming. machine, the combination with acsupporting frame, of a continuously revolving rollmounted in fixed-position upon said frame, a shaft spacedfrom and extendingparallel to the aXis'of said roll and journaled inbearings of saidframe, a cylindrical enlargementformed on said shaft ec centric to said journal bearings, an anvil pivotally mounted uponsaid cylindrical enlargement andhavingan arcuate surface concentric therewith, means to rotate said shaftto.

causesaid eccentric to move said arcuate surfacesinto frictional engagement with said roll to causerotary movement of said anvil about SEtlClCYllIldTlCLl enlargement, and a springv to rotate said anvil rearwardly upon, the inter-,

ruptionof said frictional engagement as and forthepurpose set forth.- 1 1 Aeln a bit forming machine,--the combination with a supporting frame, of a continuously revolving roll mounted in fixed p0sition'upon saidx'frame, a shaft spacedfrom and extending parallel to the axis ofsaid'roll and journaledlin bearings of said frame, a cylindrical enlargement formed on said shaft eccentric to said journal bearings, ancanvil pivotally mounted upon said cylindrical enlargement and having an arcuate surface .concentric therewith, and means to rotate said shaftto cause said eccentric to move said arcuate surface 'intoifrictional engagement with said roll as andfor'the purpose set forth.

5. In a bit forming machine, the combination with a supporting frame, of a continuously revolvingiroll mounted in fixed position upon said frame, a shaft spaced from and extending parallel to the axis of said roll and journaled in bearings of said frame, a cylindrical enlargement formed onsaid shafteccentricto said journal bearings, an'anvil pivotally' mounted upon said cylindrical enlargement and having an arcnate surface concentric therewith, means to rotate said shaft to cause said [eccentric to' move said arcuate surfaceinto frictional engagement with said roll to cause rotary movement of saidwanvil about" saidcylindrical enlargement, anda stop arranged to limit forward movement of said anvil as and for the purpose set forth.; v

6. In a-machine of the class described,the

combination with a revolving roll adapted to form one side of a cutting head,.of a die plate having a surface adapted to form theother .side of the cutting head, means to hold a bit steelin suitable relation with said dieiand roll during the forming operation, and means upon the: forming surface ofsaid die to pre- V vent the slippage of'tlie metal of the bit steel during the forming operation as andfor the purpose set forth.

7 In a machine of the class described, the

coinbination with'a revolving roll adaptedto form one side of a cutting head, of'a die plate having a surface adapted-to form the other side ofthe cutting head, means to hold a bit steel in suitable" relation with said die and roll during the forming operation, and transverselv extending grooves in the forming surface (if the die adapted to prevent-slippage 7 of the metal :of the bit steelduring the form .fortht 8. In a machine of theclass described, the

ing Operation as and combination With means to move a bit steel along a predetermined path, ofmeans efiec-J tive to form a cutting head upon said bit steel asit travels along said path,and other means move said nicking toolout of said path after thenicking. operation as and for the purpose set forth.

I 10. In a machine of-the classdescribed, the

combination with means to move a bit steel along a'fipredetermined path, of means effective to forma' cutting head upon said bit steel as it travels alongsaid path, a nicking tool resiliently heldin positionin said path adapted toen gage said bit steel to nick it, and means "to move said nicking tool out of said path after the nicking operation as and for the purpose set forth. 7

11. In a machine of the class described, the combination with means to move a bit steel along a predetermined path, of means effective to form a cutting head upon said bit steel as it travels along said path, a shaft rotatably' mounted adjacent said path, a nicking tool carried by said shaft and adapted in one position of rotary adjustment to ex,

tend into said. path to engage said bit steel to nick it, and means to rotate said nicking tool about its axis of said shaft after the forth. 1 r

j 12. In a machine of the class described, the combination With means to-move a bit steel along a predetermined path, of means effective to form a cutting head upon said bit' as it travels along said. path, a shaft rotatably mounted adjacent said path,a nicking tool carried by said shaft adapted in one position of'ro ta'ry adjustment to extend into said path m engage said bitsteelto nickit,and

for the purpose set niclting operation as and forthe purpose set automatically acting means to rotate said nicking tool out of said path after the nicking operation as and for the-purpose set forth.-

I 13; In a machine of the class described, the combination With a bit forming device, of

abit holding device adapted to move a bit steel relative to said forming device during the forming operation, of a ni'cking tool in the path of said bit steel adapted to nick it, and means actuated by said bit holding device to move said nickingtool out of the path of said bit steel after the nicking operation as and for the purpose set forth.

1 14. In a machine of the class described, the

combination'with a bit forming device, of a bit holding device adapted tomove a bit steel relativeto said forming device during the forming operation, of a shaft rotatably mounted adjacent the path of said bit steel, a nicking tool carried by said shaft and adapted to extend into the path of said bit steel to nick it, and means actuated bysaid holding device adapted to move said nicking tool out of the path of said bit steel after the nicking operation as and for the purpose set forth.

'a nicking tool carried by said shaft adapted toeXtend into the path of'said bit steel to nick-it, and a lever adapted .to beengaged i.

by'said bit holding device to rotate said nicking tool about the axis of said shaft as and for the purpose set forth.

16. In a machine of the class described, the combination With a bit forming device, of a bit holding device adapted to move a bit steel relative to said bit forming device during the forming operation, means to eject said bit steel from said holding device after the forming operation, and resilient means to deflect said bit steel laterally of said holding device When ejected as and for the purpose set forth. p

17 In a machine of the class described, the combination with a bit forming device, of a bit holding device adapted to'move a bit steel relative to said forming'device during the forming operation, means to eject the said bit steel from said holding device after said forming operation, and a-spring adapted to engage saidbit steel as it is being ejected from said holding device to deflect it laterally thereof as and for the purpose set forth.

18. In a machine of the class described, the combination With a' bit forming device, a

holding device adapted to move a bit steel relative to saidforming device during the forming operation, means to adjust the bit steel relative to the holding device, and automatically acting devicesadapted toejectsaid cable member having an upwardly open socket for receiving a blank, an abutment in the socket, an arm pivoted to a fixed element adj acent the member, means for automatically rocking said armduring the movement of said member, said arm being adapted in its rocking-to engage the abutment for displacing the latter whereby the bit is ejected from the socket.

I 21. In a bitforming machine, a driven shaft, a'rotating die thereon, said die having a continuous forming face, a die operatively movable relative to said rotating die, an armate support for said movable die, said support being pivoted at its arc center, and means for radially displacing said arcuate support into engagement with said rotating die to initiate movement of the support and its associated.

die.

22. In a machine of the class described, a power drive, a bit holding device, means operated by the power drive to eject a bit upwardly from said holding device, and means to deflect the ejected bit laterally of said holding device.

23. In a machine of the'class described, the

adapted for frictional engagement therewith,

whereby said anvil may be caused to move relative to the rollabout its a-Xis,'and a die carried by said anvil to the rear of its initial point of engagement with said roll adapted to cooperatewith said roll at all peripheral points thereof to form a cutting head upon a suitably disposed bit steel. In testimony whereof we set our hands.

"NILS'D. LEVIN. E. FEODOR MULLER.

have hereunto combination with a bit forming device, of a holding device for a bit steel, means to move one of said devices relative to the other to form the bit, and means automatically actuated by the moving device subsequent to the forming operationto eject the bit, said means including a lever mounted on said other device and tripped by the moving device. r

24. In a machine of' the class described,

the combination with a bit forming device, of a holding device for a bit steel, said hold ing device including an upwardly open" socket to receive the bit steel and a movable abutment forming the bottom of the socket, means to reciprocate one of said devices relative to the other to form the bit, and means automatically actuated by the reciprocating device subsequent to the forming operation to move the abutment'to eject the bit'upwardly, said means including a lever tripped by the movin device.

25. tion with a power driven continuously revolving roll having a'continuous peripheral forming face, of an anvil pivotally mounted adjacent said roll and having an -arcuate surface, concentric with its pivotal support In a bit forming machine, thecombina-

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